Effect of dietary mirex and PCB (Aroclor 1254) on thyroid activity and lipid reserves in rainbow trout Salmo gairdneri Richardson |
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| Authors: | J F LEATHERLAND R A SONSTEGARD†‡ |
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| Institution: | Department of Zoology, University of Guelph;Department of Microbiology, University of Guelph |
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| Abstract: | Abstract. Rainbow trout were fed diets contaminated with either PCB (Aroclor 1254, 500 μg/g dry food) or Mirex (500 μg/g dry food). There was no apparent effect of PCB on thyroid histology or on serum thyroid hormone levels. Mire effected significant reductions in serum T4 ( P <0.05) and T3 levels ( P <0.01) without apparent change om the histological appearance of the thyroi. Liver weights and total liver lipid content were significantly ( P <0.001) greater in PCB fed fish compared with controls as was the carcass lipid content ( P <0.01). Mirex had no apparent effect on liver size or liver lipid content but there was a decline in carcass lipid content ( P <0.02) which persisted 25 days after returning Mirex-fed fish to the control diet ( P <0.05). |
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